I believe its c, that makes the most sense.
So when your older you won’t struggle with health issues and live longer
That one is being watched or followed (paranoia)
Very strange behavior, seeing, hearing or smelling things that aren’t there, not being able to tell imagination from reality (psychosis)
Panic
Hallucinations
Loss of sense of personal identity
Lowered reaction time
Increased heart rate (risk of heart attack)
Increased risk of stroke
Problems with coordination (impairing safe driving or playing sports)
Sexual problems (for males)
Up to seven times more likely to contract sexually transmitted infections
than non-users (for females)
Answer:
A). The method by which a pathogen is transmitted
I believe the last answer is correct because this will enable you to measure in percentages the accuracy in order to decide when the accuracy increased.